Sexual reproduction in algae utilizes meiosis that results in the production of
A. spores with twice as much DNA as the parental cells.
B. gametes with half the amount of DNA as in the parental cells.
C. spores with the same amount of DNA as the parental cells.
D. swarming cells with the same amount of DNA as the parental cells.
B
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Which of the following organisms anaerobically reduces sulfates to hydrogen sulfide or metal sulfide?
A. Desulfovibrio B. Nitrosococcus C. Rhizobium D. Thiobacillus thiooxidans E. Thiobacillus ferrooxidans
The two amino acids depicted above both have side groups (R groups) that are
a. acidic and polar. b. uncharged and nonpolar. c. basic and polar. d. positively and negatively charged and nonpolar. e. uncharged and polar.
A neomorphic mutation could result in an allele that
A) produces no gene product. B) produces a nonfunctional gene product. C) produces a novel protein that gives rise to a new phenotype. D) produces mutant protein subunits that aggregate with wild-type subunits, inactivating them. E) produces an altered protein that functions more efficiently than the wild-type protein does.
The animal in Figure 21-2 represents:
a.
a mosasaur.
b. an ichthyosaur.
c. a pterosaur.
d. a thecodont.
e. a plesiosaur.